[tip:x86/urgent] x86/ptrace: Fix documentation for tracehook_report_syscall_entry()

[tip-bot for Elvira Khabirova]

Commit-ID:  d19f9130b814d33c03118493c17454f7d90075d1
Gitweb:     https://git.kernel.org/tip/d19f9130b814d33c03118493c17454f7d90075d1
Author:     Elvira Khabirova <lineprinter@xxxxxxxxxxxx>
AuthorDate: Sat, 10 Nov 2018 04:22:09 +0100
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 12 Nov 2018 04:53:27 +0100

x86/ptrace: Fix documentation for tracehook_report_syscall_entry()

tracehook_report_syscall_entry() is called not only
if %TIF_SYSCALL_TRACE is set, but also if %TIF_SYSCALL_EMU is set,
as appears from x86's entry code.

Signed-off-by: Elvira Khabirova <lineprinter@xxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: ldv@xxxxxxxxxxxx
Cc: oleg@xxxxxxxxxx
Cc: rostedt@xxxxxxxxxxx
Link: 20181110042209.26333972@akathisia">http://lkml.kernel.org/r/20181110042209.26333972@akathisia
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 include/linux/tracehook.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
index 40b0b4c1bf7b..df20f8bdbfa3 100644
--- a/include/linux/tracehook.h
+++ b/include/linux/tracehook.h
@@ -83,8 +83,8 @@ static inline int ptrace_report_syscall(struct pt_regs *regs)
  * tracehook_report_syscall_entry - task is about to attempt a system call
  * @regs:		user register state of current task
  *
- * This will be called if %TIF_SYSCALL_TRACE has been set, when the
- * current task has just entered the kernel for a system call.
+ * This will be called if %TIF_SYSCALL_TRACE or %TIF_SYSCALL_EMU have been set,
+ * when the current task has just entered the kernel for a system call.
  * Full user register state is available here.  Changing the values
  * in @regs can affect the system call number and arguments to be tried.
  * It is safe to block here, preventing the system call from beginning.